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Can we get DEBUG loggin from the OpenSSL library?

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@ccutrer 已经在做这个了。

开始于 2025年11月17日。

  • #963 来自 @ccutrer —— 未关闭

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技术栈
c, ruby

调研方向

从 crypto/x509/t_x509.c 中引用的 OpenSSL 调试输出开始,并将其与 Ruby 的 OpenSSL::debug 行为进行比较。查看 verify_callback 和 store_context 示例,然后确定是否可以通过向 Ruby 暴露一个 flag,在不使用应用程序级回调的情况下提供等效的证书详细信息。定义并测试所提议的接口及其预期日志记录行为后,即视为完成。

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描述

Hi,

Problem

As a developer I would like to see (DEBUG) logging from OpenSSL. We have a Ruby application that connects to Amazon Cloudfront to retrieve a file. This runs through a network outside of our control containing NAT gateways, proxies, etc.

This works 99% of the time, but Intermittently we get a self signed certificate error:

OpenSSL::SSL::SSLError (SSL_connect returned=1 errno=0 
peeraddr=18.66.171.65:443 state=error: certificate verify failed 
(self signed certificate in certificate chain))

But it doesn't show WHICH certificate (or subject, fignerprint, ...) is being seen.

Question / Request
Ideally we would have a ruby OpenSSL flag that instructs OpenSSL to do its (DEBUG) logging so we can get this information. I can see OpenSSL is logging the desired information in:

https://github.com/openssl/openssl/blob/6288aa440c1ba111eaf52cf79659a25329205022/crypto/x509/t_x509.c#L484-L501

Is it possible to get the Ruby app to log this information?

I have found OpenSSL::debug=true, but this only seems to trigger debug logging done in this Ruby Gem.

In java we have -Djava.net.debug=ssl, but I realize that is not using OpenSSL underneath.

Alternative
I have found a way to get Ruby to log the self-signed certificate that is being seen in Ruby via https://github.com/mislav/ssl-tools/blob/master/doctor.rb. Something along these lines, where the store_context contains the failed certificat:

  http.verify_callback = lambda { |verify_ok, store_context|
    if !verify_ok
      failed_cert = store_context.current_cert
      failed_cert_reason = "%d: %s" % [ store_context.error, store_context.error_string ]
    end
    verify_ok
  }

This is not ideal as it requires code changes in our Ruby apps, which is using httparty as a wrapper. Also we would be replicating logging that is already done by OpenSSL.

The fact that this SSL Docter script exists seems to confirm there is no Ruby OpenSSL::xxx flag to achieve this?

Would it be possible to implement such a flag? Is there an alternative way to achieve the same?

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